So, nowaday, unlocked phone it's the solution to all problems right? Because, we all know, every terrorist/killer/pedophile etc, have ALL their plans, past, present, future stored in a phone and of course doesn't know about "delete/delete all info's/factory reset" buttons... And of course a mass shooter, like that in this article, have a big team that helped him
1) priest said to kill
2) mom said to get weapons
3) local weapons store sold him weapons
4) uber got him at the shooting place
I'll not mention again that he surely wrote above points in the phone, because he suffered (like all other criminals) amnesia/alzheimer. yes i think unlocking his phone can 100% help to investigate and arrest all culprits, including apple that sold him phone where he stored all his plans